Patent GB-631547-A (GB)
Title: Improvements relating to plants in which solid material is subjected to heating and cooling
IPC: F02C1/05
Filed: 1947-10-03
Abstract: 631,547. Cooling material discharged from furnaces. SULZER FRERES SOC. ANON. Oct. 3, 1947, No. 26676. Convention date, Oct. 4, 1946. [Class 51 (ii)] [Also in Group XXVI] A plant in which a heated solid material is cooled by causing a gaseous cooling medium to pass through the material subsequently giving up at least a part of the heat so acquired to drive a gas turbine comprises in the form shown in Fig. 1 a chamber 1 into which cold air is injected through a pipe 6 and becoming heated enters a gas turbine 10, connected to the shaft of which is a compressor 18 and electric generator 21, the residue of heat being extracted in a steam boiler 12 and a cooler 14 the cooled gas finally entering a compressor 18 which recirculates it through the pipe 6 into the cooling chamber 1. Fig. 2 shows a modification in which the cooling gas gives up its heat in an exchanger 22 and boiler 24 before returning to the chamber the air for the turbine being taken from the atmosphere by compressor 28, preheated in exchanger 29 and then passing in succession through the exchanger 22, turbine 30, preheater 29, and steam boiler 24 then being either discharged to the atmosphere through pipe 31 or returned to the compressor via a cooler. In another arrangement the working medium of the turbine does not enter a preheater but after passing through exchanger 22 enters a combustion chamber where it is burnt with a combustion gas introduced by means of a compressor driven by the gas turbine, the combustion-products after passage through the turbine being discharged into the atmosphere through boiler 24 and pipe 31. In a further example the combustion gas is not mixed with the working medium but heats it by heat exchange the combustion-products being discharged into the atmosphere through a steam superheater, the boiler 24 and pipe 31. In another modification the working medium after leaving exchanger 22 is burnt in a combustion chamber before entering in succession a high pressure and a low pressure turbine the medium then passing to the atmosphere through a recuperator. Air is drawn from the atmosphere by means of a compressor driven by the low pressure turbine, is cooled, then passes into another compressor driven by the high pressure turbine before entering the exchanger 22 via the recuperator. Fig. 7 shows a further embodiment in which the working medium is compressed by low and high pressure compressors 65 and 66 a part being preheated in exchanger. 22 and another part in recuperator 68. After uniting the medium is again split one part being burnt with gas in a combustion chamber 76 thereby heating an exchanger'71 the combustion-products passing to high pressure and low pressure turbines 80 and 81 in series before being discharged into the atmosphere and the other part flowing through the exchanger 71, turbine 73 driving the compressors 65 and 66, and the recuperator 68 so returning to the low and high pressure compressors. The high pressure turbine 80 drives the make-up compressor 83 whilst the low pressure turbine 81 drives an electric generator 21.